Remove unused member partNode::mPrev
Remove unused member partNode::mPrev

svn path=/trunk/kdepim/; revision=258962

lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi,lefou/kdepim-noakonadi